Boat-davit gear.



- w. nusons. BOAT DAVIT GEAR.

APPLICATION FILED OCT. 28. 1915- Patnted July 18, 1916.

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WINFIELD DU'BQIS, or nn'rnorr, MICHIGAN.

To all whom it mayconccm I Be it known that I, WINFIELD DUBOIS, a citizen of the United States of America, residing at Detroit, in the county of Wayne andSt-ate of Michigan, have invented certain new and useful Improvementsin Boat- Davit Gear, of which the following is a specification, reference being had therein to the accompanying drawings. 7

[Revised United States boat regulations require the installation of some means whereby lifesaving boat. davits. can be.

safely and expeditiously swung from an in- 1 activewposition to an overhanging. active position whereby a; life saving boat .can' be quickly lowered.- In order that such requirements can be fulfilled,:I have devised a novel gear including positive and reliable means for swinging a 'davit,'s'aid gear being ofsuch construction as to remain in operative relation relative to the davit irrespective of stresses, strains 'and' lateral movements of the davit.

My invention further aims to provide davit turning mechanism? wherein the parts are constructed with a view of reducing the cost of manufacture and at the same time retain the features by which safety, durability, simplicity and ease of assembling are secured, and with such ends in view, my invention resides in the novel. construction, combination and arrangement of parts to be hereinafter specifically described and then claimed. 7

Reference will now be had to the wherein Figure 1 isa sectional View of a portion of a boat deck showing an installation of my new davit gear; Fig. 2 is an'enlarged view of a pillar or stanchion, partly broken away and partly in section; Fig. 3.is an endrawing,

larged horizontal sectional view of the davit gear, partly in plan, Fig. 4 is a cross sec-f tional view taken on or about; the line IVIV of Fig. 3, and Fig. 5-is a sectional view illustrating a modification of my invention.

In the drawings, 1 denotes a davit or boat crane having the upper curved-end thereof provided with the usual block and tackle 2 whereby a boat 3 may be raised and lowered. As illustrated, the davit or boat crane is rotatable in an upper deck 4; or roof of another deck 5, which is provided with a'bearing plate 6 for the lower end of the davit or boat crane. 1 Y

Specification of Letters Patent.

"Patented, lly is, 1916,

. Application filed October 228, 1915. Serial No. 58,322.

The davit 0r boat cranemay be'of any cross sectional area and suitably mounted thereon, adjacent to the lower end of the davitgis a two-par't clamp 7 provided with a peripheral rib 8. Bolted or otherwise connected to the peripjheralrib 8 is the web 9 'ofa large gear 10, said gear having internal annular' -tracks- 11. Mounted on the deck 5, contlguous to the lower .end of the davit 1 1s apillar or stanchion .12 terminating in a ball member 13 having a transverseopening 14. Extending through the opening let is the stem 15 of arevoluble shaft 16' provided With socket members 17 v and 18 engaging the ball member 513.

'70 The socket i member17 is shrunk or otherwise; mounted upon the stem 15 and thesocketf member 18 crank 20, thelatter being fixed for rotative continuity-with the shaft 16. On the out-er is retained thereon by a washer 19 and a end of the shaft 16, is .a worm 21 meshing with the gear 10, and this worm-is within a sectional or twopart housing 22' loose upon the shaft16. The housing 22 has parallel side flanges 23 provided with bearing2'surfacesi2 i for spindles 25 upon which revolve anti-frictional rollers .26 engaging'the annular tracks 11 of the gear 10.v The rollers 26 cooperate with the bearings 24 in supporting the housing 22 in proper relation to the gear 10, and as said housing is loose upon the shaft 16, said shaft is held with the worm normally in engagement with the gear, whereby movement imparted to the shaft16by the crank 20 causes the gear 10 to be'rotated and "the davit or boat'crane swung from its normal inactive position to an overhanging active position, whereby a boat may be'lowered .orraised. In some instances, as illustrated in 5, anti-frictional rollers 30 may be placed between the flanges23 of the housing 22, at thesides of the rollers 26, to reduce wear upon the sides of gear 10 and'cooperate with the rollers 26 in holding the housing 'in proper relation to said gear.

Should there be any flexing action of the boat crane due to a load'supp'orted thereby, the ball and socket connection. of the pillar and the shaft '16 allow said shaft to adjust itself relative to the gear 10, and should there be a lateral tilting movementof said gear, then the bearings 24 allow the housing 22 to adjust itself relative to the gear, inso;

much that the flanges 23 do not engage the ;-gear, consequently there can be a lateral tilting movement of the housing relative to the gear.

One embodiment of my invention has been illustrated but it is to be understood that the structural elements are susceptible to such variations and modifications as fall within the scope of the appended claims.

WVhat I claim is 1. The combination with a boat davit, of a gear detachably connected thereto, a pillar adjacent said gear, a revoluble shaft having aball and socket connection with said pillar, a worm on said shaft meshing with said gear, and a housing movably engaging said gear and adapted to maintain said worm in engagement therewith. 2. The combination with a rotatable boat davit, of a gear detachably connected thereto, a pillar adjacent said gear,'a revoluble shaft supported by said pillar, a worm on said shaft meshing with said gear, a housing loose on said shaft and having bear ings at the sides of said gear, means in connection with said bearings adapted to maintain said worm normally in engagement with said gear. 7

3. A turning mechanism for boat davits, comprising a gear adaptedfor attachment to a davit, a revoluble shaft adapted to adjust itself relative to said gear, a worm on said; shaft meshing with said gear, and means inclosing said worm and engaging said gear adapted to maintain said worm normally in engagement with said gear.

4. A turning mechanism for boat davits comprising a gear adapted for attachment to a davit, said gear having internal annular tracks, a revoluble shaft adjacent said gear, and adapted to adjust itself relative to said gear, a worm on said shaft meshing with said gear, a housing loose on said shaft inclosing said worm and having bearings at the sides of said gear, and revoluble rollers carried by the bearings of said housing and engaging the annular tracks of said gear.

5. A davit turning mechanism comprising a gear adapted for attachment to a davit, said gear having annular tracks, a pillar adjacent said gear, a revoluble shaft having a ball and socket connection with said pillar, a worm on said shaft meshing with said gear, a housing loose on said shaft inclosing said worm and having bearing surfaces at the sides of said gear, revoluble rollers supported by the bearing surfaces of said housing and engaging the annular tracks of said gear, and means for imparting movement to said revoluble shaft.

In testimony whereof I afiix my signature in presence of two witnesses.

WINFIELD DUBOIS. Witnesses:

ANNA M. Dona, G. E. MoGRANN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. O. 

